Pneumatic dental plugger



(NdMoaeLf 2 sheets-sheep 1.'

' EG. HUSTED.

' PNEUMATIG DENTAL PLUGGER.

No. 352,756. Patented Nov. 16,l 41886.*

a, t. W h s u. v h s 2 D. E T S U. H u E (No Model.)

PNBUMATIG DENTALA PLUGGER.

Patented Nov. 16, 1886.

HUBERT G. HUSTED,

PATENT OFFICE.

OF OBERLIN, OHIO.`

PNEUMATIC DENTAL Proces-:12.l

SPECIFIATION forming part of Letters Patent No. 352,756, dated November16, 1886.

. Application sied .my 31,1886. serial No. 209,616. (No model.)

exact description of the invention, such as will y enable others skilledin the art to which it ap- 1o pertains to make and'use the same,reference being had tothe accompanying drawings, and to the letters andfigures of reference marked thereon, which form a part of thisspecification.

My invention relates to that class of pneumatic pluggers used in theden-tal profession for packing or condensing gold or other ma-v terialin the cavity of a tooth.

Its object is to secure rapid blows onthe packing instrument or point,regulate the force of the blow, and when necessary arrest it instantlywithout stopping the engine. I secure rapidity of movement throughthegaction of an air-pump supplying air to and withdrawing it from thetubular handle, control the force of the blow by regulating theadmission and discharge of "air to and from said handle below the lineof the hammer which moves therein, and arrest the blow by closing theair-vent, thus preventing the escape of the air from the tubular handle.

In the drawings, Figure 1 represents a perspective View of my improvedpneumatic plugger. Fig. 2 represents a longitudinal sectional view ofthe .pluggen Fig. 3 represents a perspective view of an enlarged portionof thetubular'handle, showing the tube through which air is admitted anddischarged on the side thereof. Fig. 4 representsan end view of thepoint-holder, showing a series of beveled notches in the annular flangethereof. Fig. 5 represents an enlarged longitudinal section of thenose-piece and connecting parts, showing, among other features, themeans employedto retain the point-holder in place.

Fig. 6 represents a longitudinal sectional view of the nose-piece,through which a back action at an obtuse angle is communicated? to thepacking-point. Fig. 7 represents a plan view 5o of the air-pump, showingthe several connecting parts which actuate and support it. Fig.

8 represents a side view of the air-pump and crank-wheel with connectingparts and a portion of the driving-wheel of the engine. Fig.

9 represents a ycross-section of the lever by 55 which the hinged frameis raised or lowered, and the rack-bar which holds it in the requiredposition.

`In the drawings like letters and figures indicate like parts.

A is the tubular hand-piece or handle, and 1 B the perforated capscrewed thereon, through which the air is supplied to and withdrawn gfrom the handle.

C is the sliding hammer,which, through the admission and exhaust of theair, has a backand-forth movement in the tubular handle.

D is the tube-through which air is admittedv and discharged through anopening in the tubular handle. This opening is provided with a valve, F,whoseY play is regulated or stopped by the annular piece E,whieh has alongitudinal movement in tube D. By means of slot vGr'in tube D andset-screw H, moving therein,

this annular piece E may be raised or lowered. The force of the blow ofthe hammer is regulated by the position of this piece E. 1 When raisedtoits highestpoint in the slot G, the valve F has full play, thusallowing the maximum quantity of air to be admitted and discharged belowthe base of the hammer, securing thereby the full weight of the blow.When the annular piece E is lowered so that it rests upon thevalve-disk, it cuts off the'escape of the air, and this, being confinedwithin the tubular handle, prevents the hammer from striking thesocket-pin L. As' the force-of the blow is regulated by the play allowedto the valve F, it will be seen that, through the adjustment of theannular piece lil-and the quantity of air admitted or discharged throughthe valve F, any force of stroke desired may be secured. By means of thevalve F and its regulation, as described, through the adjustment of theannularv piece E, the concussion of the hammer 95 on its return-strokeis avoided. The with- 1 drawal of the air from above the hammer by theaction of the air-pump causes valve F to close, thus preventing theback-pressure of the Y air on the hammer, andthus avoiding the con- 10ocussion which would otherwise take place. M is an intermediate piecehaving a longitudinal central opening, through which the socket-pin L,which receives the blow, has free play. It is screwed to the tubularhandle at b, and is recessed from below to accommodate the collar C onthe socket-pin L, and the spiral spring l?, upon which the collar rests.

Q is the nose-piece, having longitudinal central opening for the freeplay of the socketpin L. It is screwed to the intermediate piece, M, atc.

T is the point-holder fitting into the socket formed in the lower end ofpin L, and is held firmly therein by the bent end of spring U cnteringthe beveled notches in the annular flange of the point-holder T. Thisspringis attached to the socket-pin L, and when in placein the notch notonly holds the point in place, but also prevents it from turning in thesocket. A series of these beveled notches are provided, as shown in Fig.4, so that the point S may be used in different positions withoutturning the hand-piece-a desirable convenience, especially with a curvedor bayonetshaped point. As the several points likely to be used are eachprovided with a holder, into which they are screwed or otherwisesecured, it will be seen that the substitution of one point for anothercan be quickly effected. A slight pull on the point outwardly willrelease the holder by forcing back the spring U. The under side of theannular ange being beveled, a slightV pressure on the point inwardlyreturns the holder to its place.

N is aleather washer or packinginthe recess of the intermediate piece,M, above the collar O. The pressure of this collar upon the packing whenthe socket-pin L returns after each blow prevents the entrance of airinto the handle when valve F is closed.

The air-pump 3 is shown in Figs. 7 and 8. It is connected with thetubular handle A by flexible pipe X, and has an oscillating movement ontrunnions 12 on arm 18 of movable lor hinged frame 4. This frame isconnected by means of a horizontal bolt or hinge to stationary frame G',supported by standard 14, to which it is secured by a clamping device.

16 is the vent-hole in the air-pump cylinder for the admission andexpulsion of air.

5 is the piston-rod connected to crank-wheel 2 by wrist-pin 6.

`1 is the friction-wheel, preferably faced with leather or any suitablematerial, so as to increase its frictional tendency, and to deaden itscontact with driving-wheel 17, from which it receives its motion.

The crank-wheel is actuated through shaft 7, uponwhich it is keyed, itsrapidity of movement depending upon the relative size of thefriction-wheel and driver and the speed with which, they are run. A

The lever 8 is attached at one end to the side of frame 4, thefulcrum-point of said lever being the projecting end of bolt 11. The

contact of the friction-wheel with the driver is secured by a downwardpressure on the free end of the lever. This end is held where carried bymeans of a rack-bar, 19, with which it engages, on stationary frame G.'(Shown in Fig. 9.)

The auxiliary nose-piece for securing an upward blow on thepacking-point is shown in Fig. 6. Tube cZ is screwed at its upper endupon the end of the nose-piece Q, and at its lower end upon'theangularcasing g, the lower arm of said casing being set at an obtuseangle with the line of tube cZ. Within this arm is pivoted lever Z. Theblow of the hammer is colnmunicated to socket-pin L through socketpin L,rod e, and lever Z. Socket-pin L is kept in position and caused to pressdownward upon the end of lever Z by means of spring n. Thus after eachblow the pressure of spring a causes the rod e, which rests upon theother end of the lever, to follow the return movement of socket-pin L.

The casing g, holding the lever Z, isplaced at an obtuse angle, asshown, to better facilitate operating on the back portion of the teeth,otherwise inaccessible. With the packingpoint working in the directionindicated, the operator has a freedom and scope of movement in the useof the instrument that cannot be obtained with a point working on a lineparallel with the tubular handle.

I do not coniine myself to the specic form of valve which regulates theadmission and discharge of air to and from the tubular handle, (shown inFigs. 2 'and 3,) as it is evident that other forms may be used withoutdeparting from the essential features of my invention, these being theuse of suitable means for regulating the admission and discharge of airto and from a pneumatic plugger below the sliding hammer therein. f

l/Vhat I claim as new and of my invention 1. The combinatiomwith tubularhandle A, of sliding hammer O and an adjustable valve for regulating theadmission and discharge of air to and from said handle below the hammertherein, whereby the force of the blow may be regulated or arrested,substantially as set forth.

2. The combination, with tubular handle-A and means for supplying air toand withdrawing it from said handle, of sliding hammer C, valve F, tubeD, and adjustable annular piece E, provided with set-screw H, said screwhaving a movementin slot G of tube D, substantially as set forth. y

3. The combination of tubular handle A, sliding hammer C,valve F, tubeD, for the admission and discharge of air, and means within said tubefor limiting or stopping the action of the valve, substantially as setforth and de-` scribed.

4. The combination,with tubular handle A, of sliding hammer C,adjustable valve F, intermediate piece, M, nosepiece Q, socket-pin L,spiral spring P, point-holder T, provided with a series of bevelednotches on its flanged end, and spring U, substantially as set forth.

ICO

5. The combination, with a dental plugger,

and operated as yshown and described,whereby of air-pump 3, havingpiston-rod 5, friction the plugger-point may be operated in an upandcrank wheels 1 2, keyed to shaft 7 driving-Whee117, hingedsupporting-frame 4f, sta- 5 tionary frame G, lever 8, and -rack-bar 19,substantially as set forth and described.

6. In a dental plugger, an auxiliary nosepieoe consisting of tube d, rode, supporting arm or casing g, lever Z, said lever set at an 1o obtuseangle from the line of the plugger, and

socket-pin L', provided with spring n, arranged Ward direction on alinedivergent from the line of the plugger-handle, substantially as setforth.

In testimony whereof Iafx my signature in presence of two witnesses.

HUBERT G. HUSTED. `Witnesses:

E. C. BARNARD, D. S. HUsTED. y.

